1. 4 train: Take the 4 train from Grand Central Station to the Atlantic Avenue - Barclays Center station in Brooklyn. This is the fastest route and takes about 30 minutes.
2. 2/3 train: Take the 2 or 3 train from Grand Central Station to the Clark Street station in Brooklyn. This route takes about 40 minutes.
3. 5 train: Take the 5 train from Grand Central Station to the Flatbush Avenue - Brooklyn College station in Brooklyn. This route takes about 35 minutes.